I started off with two 10" round yellow cakes. Because this was going to be a heavy cake, I used more than just cake boards. I used a sturdy board along with the cake boards and cake paper. I cut and leveled the cakes and used butter cream for the filling.
After crumb coating the cake I made about a 3" hole in the center.
With a serrated knife I started shaping the cake into a donut. It doesn't take much, just a little off the top, bottom, and sides. After that I frosted with butter cream.
I tinted my homemade marshmallow fondant with brown gel food coloring and rolled it out for the donut. The tricky part was piecing fondant in the donut hole. I used a fondant smoothing tool to help with this step.
I used some pink fondant for the donut glaze. Again rolling out the fondant and using a fondant smoothing tool. Once in place, I carefully cut out the fondant edges to make it look like glaze. I rolled out different colored fondant and cut it into large sprinkles.
The birthday boy I was making this cake for was a huge Simpsons fan, so I added a Homer made out of fondant. A little bit of frosting in the hand made him look even more like Homer.
Last touch was a banner to personalize the cake. See how easy that was!